Fixed a bug which causes infinite loop if periodicity steps over the summer time start date or end date(ex. 2008/10/27 00:00 CET). DateTime.strftime method does not work as we expected. We expect that DateTime('2008/10/27').strftime('%d') returns 27, but it returns 26 in reality. Because "2008/10/27 00:00 GMT+1" equal to "2008/10/26 23:00 GMT+2".


git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@25502 20353a03-c40f-0410-a6d1-a30d3c3de9de